148 строки
4.0 KiB
C
148 строки
4.0 KiB
C
/*
|
|
* Copyright (c) 2016 Trond Myklebust
|
|
*
|
|
* I/O and data path helper functionality.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/nfs_fs.h>
|
|
|
|
#include "internal.h"
|
|
|
|
/* Call with exclusively locked inode->i_rwsem */
|
|
static void nfs_block_o_direct(struct nfs_inode *nfsi, struct inode *inode)
|
|
{
|
|
if (test_bit(NFS_INO_ODIRECT, &nfsi->flags)) {
|
|
clear_bit(NFS_INO_ODIRECT, &nfsi->flags);
|
|
inode_dio_wait(inode);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nfs_start_io_read - declare the file is being used for buffered reads
|
|
* @inode - file inode
|
|
*
|
|
* Declare that a buffered read operation is about to start, and ensure
|
|
* that we block all direct I/O.
|
|
* On exit, the function ensures that the NFS_INO_ODIRECT flag is unset,
|
|
* and holds a shared lock on inode->i_rwsem to ensure that the flag
|
|
* cannot be changed.
|
|
* In practice, this means that buffered read operations are allowed to
|
|
* execute in parallel, thanks to the shared lock, whereas direct I/O
|
|
* operations need to wait to grab an exclusive lock in order to set
|
|
* NFS_INO_ODIRECT.
|
|
* Note that buffered writes and truncates both take a write lock on
|
|
* inode->i_rwsem, meaning that those are serialised w.r.t. the reads.
|
|
*/
|
|
void
|
|
nfs_start_io_read(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
/* Be an optimist! */
|
|
down_read(&inode->i_rwsem);
|
|
if (test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0)
|
|
return;
|
|
up_read(&inode->i_rwsem);
|
|
/* Slow path.... */
|
|
down_write(&inode->i_rwsem);
|
|
nfs_block_o_direct(nfsi, inode);
|
|
downgrade_write(&inode->i_rwsem);
|
|
}
|
|
|
|
/**
|
|
* nfs_end_io_read - declare that the buffered read operation is done
|
|
* @inode - file inode
|
|
*
|
|
* Declare that a buffered read operation is done, and release the shared
|
|
* lock on inode->i_rwsem.
|
|
*/
|
|
void
|
|
nfs_end_io_read(struct inode *inode)
|
|
{
|
|
up_read(&inode->i_rwsem);
|
|
}
|
|
|
|
/**
|
|
* nfs_start_io_write - declare the file is being used for buffered writes
|
|
* @inode - file inode
|
|
*
|
|
* Declare that a buffered read operation is about to start, and ensure
|
|
* that we block all direct I/O.
|
|
*/
|
|
void
|
|
nfs_start_io_write(struct inode *inode)
|
|
{
|
|
down_write(&inode->i_rwsem);
|
|
nfs_block_o_direct(NFS_I(inode), inode);
|
|
}
|
|
|
|
/**
|
|
* nfs_end_io_write - declare that the buffered write operation is done
|
|
* @inode - file inode
|
|
*
|
|
* Declare that a buffered write operation is done, and release the
|
|
* lock on inode->i_rwsem.
|
|
*/
|
|
void
|
|
nfs_end_io_write(struct inode *inode)
|
|
{
|
|
up_write(&inode->i_rwsem);
|
|
}
|
|
|
|
/* Call with exclusively locked inode->i_rwsem */
|
|
static void nfs_block_buffered(struct nfs_inode *nfsi, struct inode *inode)
|
|
{
|
|
if (!test_bit(NFS_INO_ODIRECT, &nfsi->flags)) {
|
|
set_bit(NFS_INO_ODIRECT, &nfsi->flags);
|
|
nfs_wb_all(inode);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nfs_end_io_direct - declare the file is being used for direct i/o
|
|
* @inode - file inode
|
|
*
|
|
* Declare that a direct I/O operation is about to start, and ensure
|
|
* that we block all buffered I/O.
|
|
* On exit, the function ensures that the NFS_INO_ODIRECT flag is set,
|
|
* and holds a shared lock on inode->i_rwsem to ensure that the flag
|
|
* cannot be changed.
|
|
* In practice, this means that direct I/O operations are allowed to
|
|
* execute in parallel, thanks to the shared lock, whereas buffered I/O
|
|
* operations need to wait to grab an exclusive lock in order to clear
|
|
* NFS_INO_ODIRECT.
|
|
* Note that buffered writes and truncates both take a write lock on
|
|
* inode->i_rwsem, meaning that those are serialised w.r.t. O_DIRECT.
|
|
*/
|
|
void
|
|
nfs_start_io_direct(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
/* Be an optimist! */
|
|
down_read(&inode->i_rwsem);
|
|
if (test_bit(NFS_INO_ODIRECT, &nfsi->flags) != 0)
|
|
return;
|
|
up_read(&inode->i_rwsem);
|
|
/* Slow path.... */
|
|
down_write(&inode->i_rwsem);
|
|
nfs_block_buffered(nfsi, inode);
|
|
downgrade_write(&inode->i_rwsem);
|
|
}
|
|
|
|
/**
|
|
* nfs_end_io_direct - declare that the direct i/o operation is done
|
|
* @inode - file inode
|
|
*
|
|
* Declare that a direct I/O operation is done, and release the shared
|
|
* lock on inode->i_rwsem.
|
|
*/
|
|
void
|
|
nfs_end_io_direct(struct inode *inode)
|
|
{
|
|
up_read(&inode->i_rwsem);
|
|
}
|